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#!/usr/bin/env python |
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# |
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# Copyright (C) 2002, 2003 by Intevation GmbH |
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# Authors: |
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# Thomas Koester <[email protected]> |
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# |
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# This program is free software under the GPL (>=v2) |
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# Read the file COPYING coming with the software for details. |
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|
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""" |
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Range class for Scientific Parameter |
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""" |
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|
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__version__ = "$Revision$" |
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# $Source$ |
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# $Id$ |
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|
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import re |
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|
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_inf = float('1e1000') # FIXME: hack for infinity |
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|
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class Range: |
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|
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number_re = '(?P<%s>-?(\d*\.?\d*([eE][\-+]?\d+)?|oo))' |
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brace_re = '(?P<%s>[][])' |
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range_re = '^' + brace_re % 'left' + number_re % 'begin' + \ |
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';' + number_re % 'end' + brace_re % 'right' + '$' |
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parse_range = re.compile(range_re) |
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|
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def __init__(self, range=None): |
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self.SetRange(range) |
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|
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def SetRange(self, range): |
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if isinstance(range, Range): |
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self.SetRange(str(range)) |
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elif range in [None, '']: |
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self.SetRange(']-oo;oo[') |
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else: |
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self._range = range |
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match = self.parse_range.match(self._range) |
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if match: |
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self._left = match.group('left') |
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self._begin = self.float(match.group('begin')) |
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self._end = self.float(match.group('end')) |
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self._right = match.group('right') |
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else: |
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raise ValueError("can't parse range: %s" % range) |
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if (self._begin > self._end or |
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(self._begin == self._end and |
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(self._left != '[' or self._right != ']'))): |
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raise ValueError("illegal range: %s" % range) |
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|
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def GetRange(self): |
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"""return internal representation of range |
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|
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4-tuple ('[' or ']', begin(float), end(float), '[' or ']') |
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|
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""" |
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return (self._left, self._begin, self._end, self._right) |
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|
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def float(self, string): |
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if string == 'oo': |
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return _inf |
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elif string == '-oo': |
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return -_inf |
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else: |
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return float(string) |
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|
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def _float2string(self, value): |
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"""convert float value to string |
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|
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(minus) infinity will be converted to (-)oo, |
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scientific notation will be used if necessary. |
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|
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""" |
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if value == _inf: |
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return 'oo' |
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elif value == -_inf: |
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return '-oo' |
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else: |
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return "%g" % value |
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|
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def string(self, range): |
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"""convert internal representation to string""" |
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left, begin, end, right = range |
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return "%s%s;%s%s" % (left, self._float2string(begin), |
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self._float2string(end), right) |
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|
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def __contains__(self, value): |
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if self._left == ']': |
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contains = value > self._begin |
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else: |
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contains = value >= self._begin |
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if self._right == '[': |
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contains = contains and (value < self._end) |
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else: |
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contains = contains and (value <= self._end) |
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return contains |
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|
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def __eq__(self, other): |
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return (self.GetRange() == other.GetRange()) |
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|
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def __ne__(self, other): |
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return not self.__eq__(other) |
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|
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def __str__(self): |
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return self.string(self.GetRange()) |
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|
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|
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def _test(): |
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range1 = Range(']0;99]') |
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print 'range1 =', range1, range1.GetRange() |
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for i in [-0.1, 0, 0.1, 9.9, 99, 99.9]: |
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print '%4.1f in range1 =' % i, i in range1 |
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range2 = Range(']-oo;10[') |
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print 'range2 =', range2, range2.GetRange() |
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for i in [-0.1, 0, 0.1, 9.9, 10, 10.1]: |
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print '%4.1f not in range2 =' % i, i not in range2 |
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range3 = Range(']1e-1;1E2]') |
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print 'range3 =', range3, range3.GetRange() |
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for i in [0, 0.1, 0.11, 10, 100, 101]: |
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print '%4.1f not in range3 =' % i, i not in range3 |
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print 'range3 != range2 =', range3 != range2 |
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print 'range3 != Range("]1e-1;1E2]") =', range3 != Range("]1e-1;1E2]") |
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|
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range4 = Range('') |
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print 'range4 =', range4, range4.GetRange() |
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|
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range5 = Range(']0;99E+00]') |
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print 'range5 =', range5, range5.GetRange() |
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range6 = Range(']0;99E+01]') |
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print 'range6 =', range6, range6.GetRange() |
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range7 = Range(']0;99E-01]') |
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print 'range7 =', range7, range7.GetRange() |
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|
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if __name__ == "__main__": |
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_test() |
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